In Python, which of the following is a correct implementation of binary search?

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Question: In Python, which of the following is a correct implementation of binary search?

Options:

Correct Answer: def binary_search(arr, x): ...

Solution:

The correct implementation of binary search involves a function that takes an array and a target value, and uses a loop to narrow down the search.

In Python, which of the following is a correct implementation of binary search?

In Python, which of the following is a correct implementation of binary search?

Step 1: Define a function that takes two parameters: an array (list of numbers) and a target value (the number you want to find).
Step 2: Initialize two variables, 'left' and 'right', to represent the start and end indices of the array.
Step 3: Use a loop that continues as long as 'left' is less than or equal to 'right'.
Step 4: Inside the loop, calculate the middle index by taking the average of 'left' and 'right'.
Step 5: Check if the middle element of the array is equal to the target value. If it is, return the middle index.
Step 6: If the middle element is less than the target value, move the 'left' index to 'middle + 1' to search the right half of the array.
Step 7: If the middle element is greater than the target value, move the 'right' index to 'middle - 1' to search the left half of the array.
Step 8: If the loop ends and the target value is not found, return -1 or a message indicating that the target is not in the array.

Binary Search Algorithm – A search algorithm that finds the position of a target value within a sorted array by repeatedly dividing the search interval in half.
Function Implementation – Understanding how to define and implement functions in Python, including parameters and return values.
Looping Constructs – Knowledge of using loops (for/while) to iterate through data structures in Python.